Question

In isochoric process:

• A. $\Delta U=\Delta Q$
• B. $\Delta Q=\Delta W$
• C. $\Delta U=\Delta W$
• D. none of these

Answer 1

Answer: (A)

An isochoric process is a constant volume process. In an isochoric process
$V=$ constant or $\Delta V=0$
So, work done
$\Delta W=P\Delta V=0$
From first law of thermodynamics
$\Delta Q=\Delta U+\Delta W$
$\Rightarrow$ $\Delta Q=\Delta U$
Note: P.V diagram of isochoric process is a straight line parallel to P-axis.